Darth Vader's lightsaber was originally powered by a crimson synth-crystal supplied by Palpatine, who also provided his own lightsaber to serve as a model. However, Vader considered his master's weapon to be an antique, and sought to create a more personalized weapon with more ballast. Wishing to impress Palpatine, Vader attempted to create a novel design, but the resulting weapon was little more than a black-alloy version of his first Jedi lightsaber.
This weapon featured a thick, ridged handgrip, a high-output diatium power cell, a dual-phase focusing crystal, forward mounted adjustment knobs, and a beveled emitter shroud. However, due to the size of his mechanical hands, Vader was forced to make the grip considerably thicker and longer than his original lightsaber, resulting in an inelegant weapon, verging on ungainly.
Due to the many modifications featured by his lightsaber, it is possible that Vader in fact created multiple weapons. Vader appears to have experimented with a rounded emitter shroud similar to his second Jedi weapon. He is known to have utilized a scarlet Adegan crystal rather than a synth-crystal on at least one of these weapons.
This is a paper model, it was designed by Xenon19 from Thailand.